src/mg_decoration.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2014-2016 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
   4 Copyright (C) 2015-2017 paramat
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21 #include "mg_decoration.h"
  22 #include "mg_schematic.h"
  23 #include "mapgen.h"
  24 #include "noise.h"
  25 #include "map.h"
  26 #include "log.h"
  27 #include "util/numeric.h"
  28 #include <algorithm>
  29
  30
  31 FlagDesc flagdesc_deco[] = {
  32         {"place_center_x",  DECO_PLACE_CENTER_X},
  33         {"place_center_y",  DECO_PLACE_CENTER_Y},
  34         {"place_center_z",  DECO_PLACE_CENTER_Z},
  35         {"force_placement", DECO_FORCE_PLACEMENT},
  36         {"liquid_surface",  DECO_LIQUID_SURFACE},
  37         {NULL,              0}
  38 };
  39
  40
  41 ///////////////////////////////////////////////////////////////////////////////
  42
  43
  44 DecorationManager::DecorationManager(IGameDef *gamedef) :
  45         ObjDefManager(gamedef, OBJDEF_DECORATION)
  46 {
  47 }
  48
  49
  50 size_t DecorationManager::placeAllDecos(Mapgen *mg, u32 blockseed,
  51         v3s16 nmin, v3s16 nmax)
  52 {
  53         size_t nplaced = 0;
  54
  55         for (size_t i = 0; i != m_objects.size(); i++) {
  56                 Decoration *deco = (Decoration *)m_objects[i];
  57                 if (!deco)
  58                         continue;
  59
  60                 nplaced += deco->placeDeco(mg, blockseed, nmin, nmax);
  61                 blockseed++;
  62         }
  63
  64         return nplaced;
  65 }
  66
  67
  68 ///////////////////////////////////////////////////////////////////////////////
  69
  70 void Decoration::resolveNodeNames()
  71 {
  72         getIdsFromNrBacklog(&c_place_on);
  73         getIdsFromNrBacklog(&c_spawnby);
  74 }
  75
  76
  77 bool Decoration::canPlaceDecoration(MMVManip *vm, v3s16 p)
  78 {
  79         // Check if the decoration can be placed on this node
  80         u32 vi = vm->m_area.index(p);
  81         if (!CONTAINS(c_place_on, vm->m_data[vi].getContent()))
  82                 return false;
  83
  84         // Don't continue if there are no spawnby constraints
  85         if (nspawnby == -1)
  86                 return true;
  87
  88         int nneighs = 0;
  89         static const v3s16 dirs[16] = {
  90                 v3s16( 0, 0,  1),
  91                 v3s16( 0, 0, -1),
  92                 v3s16( 1, 0,  0),
  93                 v3s16(-1, 0,  0),
  94                 v3s16( 1, 0,  1),
  95                 v3s16(-1, 0,  1),
  96                 v3s16(-1, 0, -1),
  97                 v3s16( 1, 0, -1),
  98
  99                 v3s16( 0, 1,  1),
 100                 v3s16( 0, 1, -1),
 101                 v3s16( 1, 1,  0),
 102                 v3s16(-1, 1,  0),
 103                 v3s16( 1, 1,  1),
 104                 v3s16(-1, 1,  1),
 105                 v3s16(-1, 1, -1),
 106                 v3s16( 1, 1, -1)
 107         };
 108
 109         // Check these 16 neighbouring nodes for enough spawnby nodes
 110         for (size_t i = 0; i != ARRLEN(dirs); i++) {
 111                 u32 index = vm->m_area.index(p + dirs[i]);
 112                 if (!vm->m_area.contains(index))
 113                         continue;
 114
 115                 if (CONTAINS(c_spawnby, vm->m_data[index].getContent()))
 116                         nneighs++;
 117         }
 118
 119         if (nneighs < nspawnby)
 120                 return false;
 121
 122         return true;
 123 }
 124
 125
 126 size_t Decoration::placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
 127 {
 128         PcgRandom ps(blockseed + 53);
 129         int carea_size = nmax.X - nmin.X + 1;
 130
 131         // Divide area into parts
 132         // If chunksize is changed it may no longer be divisable by sidelen
 133         if (carea_size % sidelen)
 134                 sidelen = carea_size;
 135
 136         s16 divlen = carea_size / sidelen;
 137         int area = sidelen * sidelen;
 138
 139         for (s16 z0 = 0; z0 < divlen; z0++)
 140         for (s16 x0 = 0; x0 < divlen; x0++) {
 141                 v2s16 p2d_center( // Center position of part of division
 142                         nmin.X + sidelen / 2 + sidelen * x0,
 143                         nmin.Z + sidelen / 2 + sidelen * z0
 144                 );
 145                 v2s16 p2d_min( // Minimum edge of part of division
 146                         nmin.X + sidelen * x0,
 147                         nmin.Z + sidelen * z0
 148                 );
 149                 v2s16 p2d_max( // Maximum edge of part of division
 150                         nmin.X + sidelen + sidelen * x0 - 1,
 151                         nmin.Z + sidelen + sidelen * z0 - 1
 152                 );
 153
 154                 // Amount of decorations
 155                 float nval = (flags & DECO_USE_NOISE) ?
 156                         NoisePerlin2D(&np, p2d_center.X, p2d_center.Y, mapseed) :
 157                         fill_ratio;
 158                 u32 deco_count = 0;
 159                 float deco_count_f = (float)area * nval;
 160                 if (deco_count_f >= 1.f) {
 161                         deco_count = deco_count_f;
 162                 } else if (deco_count_f > 0.f) {
 163                         // For low density decorations calculate a chance for 1 decoration
 164                         if (ps.range(1000) <= deco_count_f * 1000.f)
 165                                 deco_count = 1;
 166                 }
 167
 168                 for (u32 i = 0; i < deco_count; i++) {
 169                         s16 x = ps.range(p2d_min.X, p2d_max.X);
 170                         s16 z = ps.range(p2d_min.Y, p2d_max.Y);
 171
 172                         int mapindex = carea_size * (z - nmin.Z) + (x - nmin.X);
 173
 174                         s16 y = -MAX_MAP_GENERATION_LIMIT;
 175                         if (flags & DECO_LIQUID_SURFACE)
 176                                 y = mg->findLiquidSurface(v2s16(x, z), nmin.Y, nmax.Y);
 177                         else if (mg->heightmap)
 178                                 y = mg->heightmap[mapindex];
 179                         else
 180                                 y = mg->findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
 181
 182                         if (y < nmin.Y || y > nmax.Y ||
 183                                 y < y_min  || y > y_max)
 184                                 continue;
 185
 186                         if (y + getHeight() > mg->vm->m_area.MaxEdge.Y) {
 187                                 continue;
 188 #if 0
 189                                 printf("Decoration at (%d %d %d) cut off\n", x, y, z);
 190                                 //add to queue
 191                                 MutexAutoLock cutofflock(cutoff_mutex);
 192                                 cutoffs.push_back(CutoffData(x, y, z, height));
 193 #endif
 194                         }
 195
 196                         if (mg->biomemap && !biomes.empty()) {
 197                                 std::unordered_set<u8>::const_iterator iter =
 198                                         biomes.find(mg->biomemap[mapindex]);
 199                                 if (iter == biomes.end())
 200                                         continue;
 201                         }
 202
 203                         v3s16 pos(x, y, z);
 204                         if (generate(mg->vm, &ps, pos))
 205                                 mg->gennotify.addEvent(GENNOTIFY_DECORATION, pos, index);
 206                 }
 207         }
 208
 209         return 0;
 210 }
 211
 212
 213 #if 0
 214 void Decoration::placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
 215 {
 216         PcgRandom pr(blockseed + 53);
 217         std::vector<CutoffData> handled_cutoffs;
 218
 219         // Copy over the cutoffs we're interested in so we don't needlessly hold a lock
 220         {
 221                 MutexAutoLock cutofflock(cutoff_mutex);
 222                 for (std::list<CutoffData>::iterator i = cutoffs.begin();
 223                         i != cutoffs.end(); ++i) {
 224                         CutoffData cutoff = *i;
 225                         v3s16 p    = cutoff.p;
 226                         s16 height = cutoff.height;
 227                         if (p.X < nmin.X || p.X > nmax.X ||
 228                                 p.Z < nmin.Z || p.Z > nmax.Z)
 229                                 continue;
 230                         if (p.Y + height < nmin.Y || p.Y > nmax.Y)
 231                                 continue;
 232
 233                         handled_cutoffs.push_back(cutoff);
 234                 }
 235         }
 236
 237         // Generate the cutoffs
 238         for (size_t i = 0; i != handled_cutoffs.size(); i++) {
 239                 v3s16 p    = handled_cutoffs[i].p;
 240                 s16 height = handled_cutoffs[i].height;
 241
 242                 if (p.Y + height > nmax.Y) {
 243                         //printf("Decoration at (%d %d %d) cut off again!\n", p.X, p.Y, p.Z);
 244                         cuttoffs.push_back(v3s16(p.X, p.Y, p.Z));
 245                 }
 246
 247                 generate(mg, &pr, nmax.Y, nmin.Y - p.Y, v3s16(p.X, nmin.Y, p.Z));
 248         }
 249
 250         // Remove cutoffs that were handled from the cutoff list
 251         {
 252                 MutexAutoLock cutofflock(cutoff_mutex);
 253                 for (std::list<CutoffData>::iterator i = cutoffs.begin();
 254                         i != cutoffs.end(); ++i) {
 255
 256                         for (size_t j = 0; j != handled_cutoffs.size(); j++) {
 257                                 CutoffData coff = *i;
 258                                 if (coff.p == handled_cutoffs[j].p)
 259                                         i = cutoffs.erase(i);
 260                         }
 261                 }
 262         }
 263 }
 264 #endif
 265
 266
 267 ///////////////////////////////////////////////////////////////////////////////
 268
 269
 270 void DecoSimple::resolveNodeNames()
 271 {
 272         Decoration::resolveNodeNames();
 273         getIdsFromNrBacklog(&c_decos);
 274 }
 275
 276
 277 size_t DecoSimple::generate(MMVManip *vm, PcgRandom *pr, v3s16 p)
 278 {
 279         // Don't bother if there aren't any decorations to place
 280         if (c_decos.size() == 0)
 281                 return 0;
 282
 283         if (!canPlaceDecoration(vm, p))
 284                 return 0;
 285
 286         content_t c_place = c_decos[pr->range(0, c_decos.size() - 1)];
 287
 288         s16 height = (deco_height_max > 0) ?
 289                 pr->range(deco_height, deco_height_max) : deco_height;
 290
 291         bool force_placement = (flags & DECO_FORCE_PLACEMENT);
 292
 293         v3s16 em = vm->m_area.getExtent();
 294         u32 vi = vm->m_area.index(p);
 295         for (int i = 0; i < height; i++) {
 296                 vm->m_area.add_y(em, vi, 1);
 297
 298                 content_t c = vm->m_data[vi].getContent();
 299                 if (c != CONTENT_AIR && c != CONTENT_IGNORE &&
 300                                 !force_placement)
 301                         break;
 302
 303                 vm->m_data[vi] = MapNode(c_place, 0, deco_param2);
 304         }
 305
 306         return 1;
 307 }
 308
 309
 310 int DecoSimple::getHeight()
 311 {
 312         return (deco_height_max > 0) ? deco_height_max : deco_height;
 313 }
 314
 315
 316 ///////////////////////////////////////////////////////////////////////////////
 317
 318 size_t DecoSchematic::generate(MMVManip *vm, PcgRandom *pr, v3s16 p)
 319 {
 320         // Schematic could have been unloaded but not the decoration
 321         // In this case generate() does nothing (but doesn't *fail*)
 322         if (schematic == NULL)
 323                 return 0;
 324
 325         if (!canPlaceDecoration(vm, p))
 326                 return 0;
 327
 328         if (flags & DECO_PLACE_CENTER_X)
 329                 p.X -= (schematic->size.X - 1) / 2;
 330         if (flags & DECO_PLACE_CENTER_Y)
 331                 p.Y -= (schematic->size.Y - 1) / 2;
 332         if (flags & DECO_PLACE_CENTER_Z)
 333                 p.Z -= (schematic->size.Z - 1) / 2;
 334
 335         Rotation rot = (rotation == ROTATE_RAND) ?
 336                 (Rotation)pr->range(ROTATE_0, ROTATE_270) : rotation;
 337
 338         bool force_placement = (flags & DECO_FORCE_PLACEMENT);
 339
 340         schematic->blitToVManip(vm, p, rot, force_placement);
 341
 342         return 1;
 343 }
 344
 345
 346 int DecoSchematic::getHeight()
 347 {
 348         // Account for a schematic being sunk into the ground by flag.
 349         // When placed normally account for how a schematic is placed
 350         // sunk 1 node into the ground.
 351         return (flags & DECO_PLACE_CENTER_Y) ?
 352                 (schematic->size.Y - 1) / 2 : schematic->size.Y - 1;
 353 }